1. He couldn't hang out with us last night beacause he had a lot of homework.

2. My mother doesn't like pop music and my sister doesn't, either.

3. How did they get there? By bus or by taxi?

4. I had a headache yesterday, so I didn't go to school.

5. They play very well, but they didn't win.

6. She didn't have a map, so she got lost.

7. She passed the examinations easily, although she isn't intelligent.

8. I love reading books, and my younger brother does, too.

9. Minh enjoys watching football matches on TV, but he never plays it.

1.because

2.and

3.or

4.so

5.but

6.so

7.although

8.and

9.but